gstreamer/gstreamer-sharp/Pad.custom

		[DllImport("gstreamer-0.10.dll")]
		static extern bool gst_pad_query_position(IntPtr raw, ref Format format, out long cur);

		public bool QueryPosition(Gst.Format format, out long cur) {
			return gst_pad_query_position(Handle, ref format, out cur);
		}

		[DllImport("gstreamer-0.10.dll")]
		static extern bool gst_pad_query_duration(IntPtr raw, ref Format format, out long duration);

		public bool QueryDuration(Gst.Format format, out long duration) {
			return gst_pad_query_duration(Handle, ref format, out duration);
		}